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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60c2f87312d75c72f5e7823a96c959e3d1d962e6d4ca9bf189a0e9c74a75b3b' 
  AND token = 'EqXMCMEow+wWuYPkMMVXbmAYswhcG9jFhwVLoF3V7t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}